Regarding the title, it’s nice to see the man identified purely by his relationship to someone else, for once! (And while it isn’t immediate from the title, that “someone else” is herself a woman.)
But if you came to this story from its title hoping for time-travel, you might end up being disappointed — it really truly is the story of her husband, the story of the one who is left behind and who has to make a life living each moment in time successively. We never know his name, but we learn intimate details of his life, his relationship with his wife, and also his relationship with his father. The time traveling isn’t incidental, but it is definitely the backdrop for the telling of the relationships, not the story itself.
It was a beautifully sad story, and also a beautiful story. Midway through, it felt like it could continue in the vein it opened in without any resolution, but then it looped back on itself coming around full circle. I found the ending satisfying.